feat: add AI Teaching Assistant component with chat functionality (#814)

* feat: add AI Teaching Assistant component with chat functionality

- Implemented AITeachingAssistant component for interactive AI chat.
- Created API endpoint for chat interactions with AI providers.
- Integrated multiple AI providers (Google Gemini, Azure, OpenAI, Phi-3) with fallback mechanism.
- Added offline fallback script for improved user experience.
- Enhanced user interface with responsive design and error handling.

* Update src/pages/courses/web-development/[moduleId]/[lessonId].tsx

Co-authored-by: Copilot <[email protected]>

* Update src/components/ai-assistant/AITeachingAssistant.tsx

Co-authored-by: Copilot <[email protected]>

---------

Co-authored-by: Copilot <[email protected]>

Author: jeromehardaway

.env.example

@@ -14,4 +14,23 @@ GITHUB_CLIENT_SECRET="your-github-client-secret"
 
 # Optional: Other OAuth providers
 # GOOGLE_CLIENT_ID="your-google-client-id"
-# GOOGLE_CLIENT_SECRET="your-google-client-secret"
+# GOOGLE_CLIENT_SECRET="your-google-client-secret"
+
+# AI Teaching Assistant (J0d!e) - Phase 5
+# Primary AI provider: gemini | azure | openai | phi3
+PRIMARY_AI_PROVIDER="gemini"
+
+# Google Gemini (recommended for cost-effectiveness)
+GOOGLE_GENERATIVE_AI_API_KEY="your-google-ai-api-key"
+
+# Azure OpenAI (GPT-4)
+AZURE_OPENAI_API_KEY="your-azure-openai-key"
+AZURE_OPENAI_ENDPOINT="https://your-resource.openai.azure.com"
+AZURE_OPENAI_DEPLOYMENT="your-gpt4-deployment-name"
+
+# OpenAI (GPT-4)
+OPENAI_API_KEY="your-openai-api-key"
+
+# Phi-3 (optional - for local/Azure AI Studio deployment)
+PHI3_ENDPOINT="your-phi3-endpoint"
+PHI3_API_KEY="your-phi3-api-key"